<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width:200px;
            height: 200px;
            background:red;
        }
        div:hover{
            background:pink;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>